Our skill: blown film
Blow extrusion – How does it work ?
Granulates are heated at high temperature (200°C for PE) and molded into a kind of paste. The plastic is conveyed forward by a rotating screw inside a heated barrel and softened by both friction and heat. The softened plastic is then forced upwards through a circular die in a shape of a hollow tube.
The tube is expanded with air above the die. Once cooled the tube is cut on both lateral sides and collapsed by nip rollers.
Changing the speed of the screw rotation and nip rollers will change the gauge of the film.
A Blown Film Production Line :